| Abstract | Numerical modeling of soot formation has been conducted for an axisymmetric, laminar, coflow diffusion ethylene-air flame by two different methods to deal with the inlet boundary condition. The first method cannot account for the preheating of both fuel and air streams, while the second can. A detailed reaction mechanism, which consists of 36 species and 219 reactions, and complex thermal and transport properties are used. The fully coupled elliptic equations are solved. A simple two-equation soot model is coupled with the detailed gas-phase chemistry. The interactions between the soot and gas-phase chemistry are taken into account. The predicted results are compared with those from experiment. Both methods give reasonable flame temperature and soot volume fraction distributions. Quantitatively the second method results in improved flame temperatures and soot volume fractions, especially in the region near the fuel inlet, although the maximum flame temperatures from both methods are slightly lower than that from the experiment. |
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